用于固态锂金属电池的分子调控聚合物电解质:机理和前景

IF 15 1区 工程技术 Q1 ENERGY & FUELS Etransportation Pub Date : 2023-10-01 DOI:10.1016/j.etran.2023.100264
Mengnan Shen, Zhiyan Wang, Dongming Cheng, Hang Cheng, Henghui Xu, Yunhui Huang
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引用次数: 1

摘要

固体聚合物电解质(spe)由于其优异的柔性、可加工性和优异的安全性,近年来在固态锂金属电池(sslmb)中得到了广泛的应用。然而,平衡优异的离子电导率和机械稳健性仍然是spe的瓶颈。目前,大多数研究都集中于在聚合物基体中掺入各种填料来克服上述障碍。然而,填料的比表面积大,容易团聚,导致在spe中分散不均匀,这将中断锂离子迁移的连续性,导致填料/聚合物界面不稳定。因此,在分子水平上直接调节聚合物电解质,而不是加入填料,可以有效地避免上述障碍,同时获得优异的性能。本文综述了电解质在分子水平上的三种调节机制,包括设计聚合物基质、添加可溶性添加剂和建立分子相互作用。通过分子调控聚合物基体,构建三维网络,接枝特殊官能团,以及spe中的配位相互作用,避免了第二相的产生和不稳定的填料/聚合物界面。希望本综述能够启发人们在分子水平上对spe的直接调控进行深入的认识,进一步提高spe的离子电导率和机械稳健性。
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Molecular regulated polymer electrolytes for solid-state lithium metal batteries: Mechanisms and future prospects

Solid polymer electrolytes (SPEs) have been widely adopted in solid-state lithium metal batteries (SSLMBs) recently due to their excellent flexibility, superior processability and outstanding safety. However, balancing excellent ionic conductivity and mechanical robustness of SPEs is still a bottleneck. Currently, most researches focus on the incorporation of various fillers into polymer matrix to overcome the mentioned obstacle. Nevertheless, the large specific surface area of fillers makes them easy to agglomerate, resulting in uneven dispersion in SPEs, and this would interrupt the continuity of lithium ion migration and cause unstable filler/polymer interfaces. Therefore, direct regulation of polymer electrolytes at molecular level instead of incorporating fillers will effectively avoid the above obstacle while obtaining excellent performance. In this review, three kinds of mechanisms of electrolyte regulation at the molecular level are presented, including designing polymer matrix, adding soluble additives, and building molecular interactions. Through molecularly regulating the polymer matrix, constructing three-dimensional (3D) networks, grafting of special functional groups, and coordination interactions in SPEs, the creation of second phases and unstable filler/polymer interfaces are all avoided. It is hoped that this review can inspire an in-depth understanding on direct regulation of SPEs at the molecular level, further improving ionic conductivity and mechanical robustness of SPEs.

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来源期刊
Etransportation
Etransportation Engineering-Automotive Engineering
CiteScore
19.80
自引率
12.60%
发文量
57
审稿时长
39 days
期刊介绍: eTransportation is a scholarly journal that aims to advance knowledge in the field of electric transportation. It focuses on all modes of transportation that utilize electricity as their primary source of energy, including electric vehicles, trains, ships, and aircraft. The journal covers all stages of research, development, and testing of new technologies, systems, and devices related to electrical transportation. The journal welcomes the use of simulation and analysis tools at the system, transport, or device level. Its primary emphasis is on the study of the electrical and electronic aspects of transportation systems. However, it also considers research on mechanical parts or subsystems of vehicles if there is a clear interaction with electrical or electronic equipment. Please note that this journal excludes other aspects such as sociological, political, regulatory, or environmental factors from its scope.
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